IR2121 Low-Side Gate Driver IC - Equivalent & Substitute Parts

Part Overview

The IR2121 is a low-side gate driver IC manufactured by Infineon Technologies, designed to drive IGBT and N-Channel MOSFET devices in power management applications. The device operates with a supply voltage range of 12V to 18V and delivers peak output currents of 1.6A (source) and 3.3A (sink). The IR2121 is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

IR2121

Infineon TechnologiesIn Stock: 1524IR2121 Datasheet

Current PartRFQ

IR2121PBF

Infineon TechnologiesIn Stock: 1342IR2121PBF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IR2121 is determined by strict equivalence across the following critical parameters:

• Driven Configuration: Low-Side operation
• Channel Type: Single channel
• Gate Type: IGBT and N-Channel MOSFET compatibility
• Voltage - Supply: 12V ~ 18V range
• Logic Voltage Thresholds: VIL 0.8V, VIH 2.2V
• Current - Peak Output: 1.6A source, 3.3A sink
• Input Type: Non-Inverting
• Rise / Fall Time: 43ns rise, 26ns fall (typical)
• Operating Temperature: -40°C ~ 150°C (TJ)
• Package / Case: 8-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole

The IR2121PBF is identified as a direct substitute based on identical electrical specifications and mechanical compatibility across all parameters listed above.

Parameter Comparison

Engineering Selection Recommendations

The IR2121PBF is the direct substitute for the IR2121. Both components are manufactured by Infineon Technologies and share identical electrical and mechanical specifications. The primary distinction is product status and regulatory compliance: the IR2121 is obsolete, while the IR2121PBF maintains active product status and achieves ROHS3 compliance. For new designs and ongoing system support, the IR2121PBF is the appropriate selection. Both components are REACH Unaffected and classified under ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can the IR2121PBF be used as a direct replacement for the IR2121?

A: Yes. The IR2121PBF is electrically and mechanically identical to the IR2121 across all specified parameters, including supply voltage, output current ratings, logic thresholds, timing characteristics, and package configuration. Direct substitution is valid.

Q: What is the difference between IR2121 and IR2121PBF?

A: The IR2121PBF differs from the IR2121 in product status and regulatory compliance. The IR2121 is obsolete and RoHS non-compliant, while the IR2121PBF is active and ROHS3 compliant. Electrical and mechanical specifications are identical.

Q: Are there packaging differences between these parts?

A: Both the IR2121 and IR2121PBF use the same 8-DIP (0.300", 7.62mm) through-hole package. The IR2121PBF is supplied in Tube packaging, while the IR2121 packaging specification is not provided. Pin configuration and board layout compatibility are identical.

Q: Is the IR2121PBF suitable for applications requiring RoHS compliance?

A: Yes. The IR2121PBF is ROHS3 compliant, making it suitable for applications with RoHS requirements. The original IR2121 is RoHS non-compliant.

Q: What are the critical parameters for substitution compatibility?

A: Substitution compatibility is determined by: driven configuration (low-side), channel type (single), gate type (IGBT/N-Channel MOSFET), supply voltage (12V ~ 18V), logic voltage thresholds (0.8V/2.2V), peak output current (1.6A/3.3A), input type (non-inverting), timing characteristics (43ns/26ns), operating temperature range (-40°C ~ 150°C), and package type (8-DIP through-hole).